Sheboygan Water Hardness & Quality Report (2026)

The Sheboygan Water Utility serves the City of Sheboygan, Sheboygan Falls, and Village of Kohler in Sheboygan County, Wisconsin, providing about 15 million gallons daily. The primary source is Lake Michigan via a joint intake system on the lakeshore, supplemented by groundwater from local wells. Treatment occurs at the utility's plant with filtration, disinfection, and chemical adjustment. The 2024 Consumer Confidence Report confirms compliance with copper at 21 ppb (90th percentile, well below the 1,300 ppb action level), with no violations noted for primary contaminants.

Water enters via the Lake Michigan watershed, draining from glacial till over Precambrian shield rocks upstream but locally influenced by dolomitic limestones of the Silurian period. Groundwater derives from the confined Eastern Dolomite Aquifer beneath Sheboygan County, where dissolution of carbonate rocks — Silurian dolomite and limestone layers of the Niagara Escarpment — enriches the water with calcium and magnesium. This limestone-dolomite geology naturally imparts a hard character to the supply through mineral dissolution in karst features and fractures.

At hard water levels, scale buildup clogs pipes, heaters, and fixtures, reducing flow and efficiency. Water heaters, dishwashers, washing machines, and coffee makers suffer most, with shortened lifespans and higher energy costs. Regular system flushing, vinegar descaling, and magnetic treatments help mitigate; a whole-house water softener is strongly recommended to protect appliances, cut soap use, and prevent spots on glassware. Lake Michigan source water undergoes conventional treatment — screening, coagulation, sedimentation, filtration, and chlorination — before distribution.